package com.manage.util;

import java.io.IOException;
import java.io.OutputStream;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Iterator;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFCellStyle;
import org.apache.poi.hssf.usermodel.HSSFClientAnchor;
import org.apache.poi.hssf.usermodel.HSSFComment;
import org.apache.poi.hssf.usermodel.HSSFFont;
import org.apache.poi.hssf.usermodel.HSSFPatriarch;
import org.apache.poi.hssf.usermodel.HSSFRichTextString;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.hssf.util.HSSFColor;

public class ExportExcel<T>
{
	public void exportExcel(String[] headers, Collection<T> dataset,
			OutputStream out)
	{
		exportExcel("测试POI导出EXCEL文档", headers, dataset, out, "yyyy-MM-dd");
	}

	@SuppressWarnings("unchecked")
	public void exportExcel(String title, String[] headers,
			Collection<T> dataset, OutputStream out, String pattern)
	{
		// 声明一个工作薄
		HSSFWorkbook workbook = new HSSFWorkbook();
		// 生成一个表格
		HSSFSheet sheet = workbook.createSheet(title);
		// 设置表格默认列宽度为15个字节
		sheet.setDefaultColumnWidth((short) 15);
		// 生成一个样式
		HSSFCellStyle style = workbook.createCellStyle();
		// 设置这些样式
		style.setFillForegroundColor(HSSFColor.SKY_BLUE.index);
		style.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		// 生成一个字体
		HSSFFont font = workbook.createFont();
		font.setColor(HSSFColor.VIOLET.index);
		font.setFontHeightInPoints((short) 12);
		font.setBoldweight(HSSFFont.BOLDWEIGHT_BOLD);
		// 把字体应用到当前的样式
		style.setFont(font);
		
		// 生成并设置另一个样式
		HSSFCellStyle style2 = workbook.createCellStyle();
		style2.setFillForegroundColor(HSSFColor.LIGHT_YELLOW.index);
		style2.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style2.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style2.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style2.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style2.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style2.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		style2.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
		// 生成另一个字体
		HSSFFont font2 = workbook.createFont();
		font2.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
		// 把字体应用到当前的样式
		style2.setFont(font2);
		
		// 生成并设置另一个样式
		HSSFCellStyle style3 = workbook.createCellStyle();
		style3.setFillForegroundColor(HSSFColor.GREY_25_PERCENT.index);
		style3.setFillPattern(HSSFCellStyle.SOLID_FOREGROUND);
		style3.setBorderBottom(HSSFCellStyle.BORDER_THIN);
		style3.setBorderLeft(HSSFCellStyle.BORDER_THIN);
		style3.setBorderRight(HSSFCellStyle.BORDER_THIN);
		style3.setBorderTop(HSSFCellStyle.BORDER_THIN);
		style3.setAlignment(HSSFCellStyle.ALIGN_CENTER);
		style3.setVerticalAlignment(HSSFCellStyle.VERTICAL_CENTER);
		// 生成另一个字体
		HSSFFont font3 = workbook.createFont();
		font3.setBoldweight(HSSFFont.BOLDWEIGHT_NORMAL);
		// 把字体应用到当前的样式
		style3.setFont(font3);

		// 声明一个画图的顶级管理器
		HSSFPatriarch patriarch = sheet.createDrawingPatriarch();
		// 定义注释的大小和位置,详见文档
		HSSFComment comment = patriarch.createComment(new HSSFClientAnchor(0,
				0, 0, 0, (short) 4, 2, (short) 6, 5));
		// 设置注释内容
		comment.setString(new HSSFRichTextString("可以在POI中添加注释！"));
		// 设置注释作者，当鼠标移动到单元格上是可以在状态栏中看到该内容.
		comment.setAuthor("xy");

		// 产生表格标题行
		HSSFRow row = sheet.createRow(0);
		for (short i = 0; i < headers.length; i++)
		{
			HSSFCell cell = row.createCell(i);
			cell.setCellStyle(style);
			HSSFRichTextString text = new HSSFRichTextString(headers[i]);
			cell.setCellValue(text);
		}

		// 遍历集合数据，产生数据行
		Iterator<T> it = dataset.iterator();
		int index = 0;
		boolean styleFlag = false;//是否进行样式区分
		String tempTextValue = "";
		while (it.hasNext())
		{
			index++;
			row = sheet.createRow(index);
			T t = (T) it.next();
			// 利用反射，根据javabean属性的先后顺序，动态调用getXxx()方法得到属性值
			Field[] fields = t.getClass().getDeclaredFields();
			for (short i = 0; i < fields.length; i++)
			{
				HSSFCell cell = row.createCell(i);
				
				Field field = fields[i];
				String fieldName = field.getName();
				String getMethodName = "get"
						+ fieldName.substring(0, 1).toUpperCase()
						+ fieldName.substring(1);
				try
				{
					Class tCls = t.getClass();
					Method getMethod = tCls.getMethod(getMethodName,
							new Class[]
							{});
					Object value = getMethod.invoke(t, new Object[]
					{});
					if(value == null)
						value = "";
					// 判断值的类型后进行强制类型转换
					String textValue = null;
					if (value instanceof Date)
					{
						Date date = (Date) value;
						SimpleDateFormat sdf = new SimpleDateFormat(pattern);
						textValue = sdf.format(date);
					}
					else if (value instanceof byte[])
					{
						// 有图片时，设置行高为60px;
						row.setHeightInPoints(60);
						// 设置图片所在列宽度为80px,注意这里单位的一个换算
						sheet.setColumnWidth(i, (short) (35.7 * 80));
						// sheet.autoSizeColumn(i);
						byte[] bsValue = (byte[]) value;
						HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0,
								1023, 255, (short) 6, index, (short) 6, index);
						anchor.setAnchorType(2);
						patriarch.createPicture(anchor, workbook.addPicture(
								bsValue, HSSFWorkbook.PICTURE_TYPE_JPEG));
					}
					else
					{
						// 其它数据类型都当作字符串简单处理
						textValue = value.toString();
					}
					// 如果不是图片数据，就利用正则表达式判断textValue是否全部由数字组成
					if (textValue != null)
					{
						Pattern p = Pattern.compile("^//d+(//.//d+)?$");
						Matcher matcher = p.matcher(textValue);
						if (matcher.matches())
						{
							// 是数字当作double处理
							cell.setCellValue(Double.parseDouble(textValue));
						}
						else
						{
							HSSFRichTextString richString = new HSSFRichTextString(
									textValue);
							HSSFFont font4 = workbook.createFont();
							font4.setColor(HSSFColor.BLUE.index);
							richString.applyFont(font4);
							cell.setCellValue(richString);
						}
					}
					if (i == 0 && !tempTextValue.equals(textValue))
					{
						// 首列，前后两次值相同，则不设置不同样式
						styleFlag = true;
					}
					if (styleFlag)
					{
						//首列、且标志位为true，设置不同样式进行却别
						cell.setCellStyle(style3);
					}
					else
					{
						cell.setCellStyle(style2);
					}
					if (i == 0)
					{
						tempTextValue = textValue;
					}
				}
				catch (SecurityException e)
				{
					e.printStackTrace();
				}
				catch (NoSuchMethodException e)
				{
					e.printStackTrace();
				}
				catch (IllegalArgumentException e)
				{
					e.printStackTrace();
				}
				catch (IllegalAccessException e)
				{
					e.printStackTrace();
				}
				catch (InvocationTargetException e)
				{
					e.printStackTrace();
				}
				finally
				{
					// 清理资源
				}
			}
			styleFlag = false;//重置状态
		}
		try
		{
			workbook.write(out);
		}
		catch (IOException e)
		{
			e.printStackTrace();
		}
	}
}

